Mine started doing the same thing last winter... ended up being the fuel bowl drain valve O-Ring... Changed it out and it hasn't leaked since...
If you're in a pinch you could always flip the old o-ring over... it'll reseal and hold ya over for a little while or long depending on how lucky you get...

The drain valve is on the back of the fuel bowl with the yellow handle looking thing. The o rings were my problem but I took it off and couldnt find any to go back on so I just put it back together and hasnt leaked a drop since and thats been about a year.

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